Lapsed Mar 13, 2019 on the fee record · High confidence
20-year base term ended Sep 1, 2024
Third maintenance fee unpaid; grace period ended.
Held by Cadence Design Systems, Inc.
Filed Sep 1, 2004 as application 10/933,090 · Granted Mar 13, 2007
Base term, 20 years from filing, plus 367 days of patent term adjustment (USPTO delay)
Today
Lapsed Mar 13, 2019
2004
2026
Clock starts
Sep 1, 2004
Sep 1, 2004
No longer in force
Mar 13, 2019
Mar 13, 2019
Granted
Mar 13, 2007
Mar 13, 2007
Term would have run to
Sep 3, 2025
Sep 3, 2025
base term
patent term adjustment
after the term ends
fee events
Updated Nov 14, 2026 · includes USPTO assignment & status data published Nov 14, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
367
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
2 of 3
Maintenance fees paid
Three maintenance fees fall due, at 3.5, 7.5 and 11.5 years from grant. This counts the ones the record shows paid.
11
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.
Its term would have run to Sep 3, 2025: its 20-year base term plus 367 days of term adjustment for prosecution delay. Confidence: High. from the record
How we calculated this date
One row per rule, each showing its own input and what it did to the date. A step we could not verify says so instead of resolving itself.
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Sep 1, 2004, when this application, 10/933,090, was filed | Sep 1, 2024 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +367 days, USPTO patent term adjustment record | Sep 3, 2025 | High confidence |
| Terminal disclaimer cap | None on record | no cap applied | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 3 maintenance fees paid | lapsed Mar 13, 2019 | High confidence |
| Computed term end | The steps above, in order | Mar 13, 2019 | High confidence |
This family
| US 7,275,225 | Term ended Apr 2025 | Apr 2025 |
| US 7,277,165 | Term ended May 2025 | May 2025 |
| US 7,266,800 | Term ended Apr 2025 | Apr 2025 |
| US 7,246,343 | Term ended Apr 2025 | Apr 2025 |
| US 7,189,481 | this patent Mar 2019 | Mar 2019 |
| US 7,337,421 | Term ended Aug 2025 | Aug 2025 |
| Application 10/960,357 | Abandoned not computed | not computed |
| US 7,588,868 | In force Aug 2027 | Aug 2027 |
8 of 11 applications in this family shown, earliest filings first. The applications whose file history this site holds. The family may have others.
Assignments
Assignment documents as recorded at the USPTO, oldest first, with the reel and frame each was recorded at. A recorded assignment is a filed document, not a statement of current ownership, and the absence of a later one is not evidence that the last one still stands.
| Recorded | Assignor | Assignee | Conveyance |
|---|---|---|---|
| Sep 17, 2004 Reel 15146, frame 938 | Wu, Bo; Sezginer, Abdurrahman; Zach, Franz X. | Invarium, Inc. | Assignment of Assignor's Interest |
| Jun 19, 2008 Reel 21123, frame 355 | Invarium, Inc. | Cadence Design Systems, Inc. | Assignment of Assignor's Interest |
Sources
Google Patents · The patent document at USPTO · Assignment records at USPTO
USPTO account required: This application in Patent Center · USPTO's maintenance fee lookup
Maintenance fee events come from USPTO's own fee records. Its fee lookup asks for the patent number and the application number.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Note
The 367 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
2
later US patents cite this one
That is below the median of utility patents granted in 2007 in our data, the only group it is compared against.
How we rank
Every date shows its work: the base term, any term adjustment or extension, any disclaimer cap, and the maintenance fee record, each with a confidence tier. How this record was built
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.